FACsPb Triple Halide Perovskite Solar Cells with Thermal Operation over 200?C

Formamidinium cesium (FACs) perovskites solar cells have been shown to be among the most stable metal halide perovskites. Here, high-temperature data are presented which systematically and statistically demonstrate the high thermal operation of this system to temperatures in excess of 200 degrees C. Device measurements between 250 K and 490 K show that while some loss of performance is evident at higher temperature, this is driven by reversible halide segregation with no evidence of a structural phase transition over the measurement range probed. Moreover, upon reduction of the temperature back to ambient the power conversion efficiency is retained.

Automated summary

Formamidinium cesium (FACs) perovskites solar cells have high thermal stability, as demonstrated through high-temperature data showing operation at temperatures exceeding 200 degrees C. Device measurements between 250 K and 490 K indicate reversible halide segregation as the cause of performance loss at higher temperatures, with no evidence of a structural phase transition. The power conversion efficiency is retained when the temperature is reduced back to ambient.